If Longines take the movement of the Omega speedmaster, your dream can be come tru.
Swatch group. But, if they share movements freely? Is that their way, i do not know.
I own a Tissot, and i can say it is a kind of a Swatch. So Longines could use Omega movements to serve a part of the market who ask for manual winding chrono’s.
I know that Longines have not much manual windings in their collection. I am frequently on their website.
Like the brand.